Copy sheet



Patented Jo o 21, 1939 UNITED STATES 2,183,934 cor! snna'r Howard E.Collins, La Grange; alslgnor to Ditto, Incorporated, Chicago, Ill., acorporation of West -No Drawing. Application March 5, 1938, Serial Noliiidlt 11 Claims. '(0i. 41-413) This invention relates to animprovement i copy sheets and more particularly to master cop sheets,adapted to give designs of higher col intensity in a duplicatingprocesswherein a de- 5 sign to be reproduced is applied to a master copy ,sheetby typewriting and the like, the design on. the master copy sheetcontacted with a duplicat ing' mass, and copies madeby. contacting copysheets in succession with the design on the 10 duplicating mass.

In the usual ,hectograph duplicating process a g a design formed of awater and glycerin soluble dye is applied to an ordinary paper sheetsuch as bontLpaper to form a master copy. The de-- sign on themastercopy is then contacted with a duplicating mass consisting ofgelatin, glycerin *and water, whereupon the dye of the design is largelytransferred to the hectograph mass, form- 2 ing a reverse image of thedesign. Copies are then made by contacting copy sheets withthe design onthe'hectograph mass. Where the dye used in forming the. designs isnot'readily soluble v in water and glycerin, the colol'-oi the design on5' the copies is of poor intensity after only a few copies have beenmade. This is particularly true of black basic nigrosine, and also ofhighly light absorbent combinations of basic as the mixtures of fuchineand malachite green in the proportion of 1:2. I

In accordance with this inventicnthere is distributed on the surface ofa copy sheet a glycerin miscible solvent which has a greater solvent apower thanglycerin for basic nigrosine and other like transfer dyes.One.embodi'ment oi the invention is a paper copy sheet having a coatingof a relatively nonvolatile solventselected from the group consisting0!: 11011101038 of Cellbsolve (ethylene glycol ethyl ether) andOarbitol" (di-ethylene glycol V ethyl ether). 7 The solvent may beapplied to the paper sheet and bound thereto by any suitable means known45 to the art. It may be incorporated with the pulp during the processof manufacture of the 1 paper so that the finished paper the solvent'uniforrnly'distributed in it. It may also be applied to a paperv sheetcoated with-some with otherfconstituents.

the invention:

122" sheetof paper.

'flve intense black .copies could be produced in A The followingexamples are 'given to Example 1 Asheet of sulphite bond paper 1 7" l):22"} is coated with the" following composition:

Dimethoxytetra glycol (dimethyl etherof a tetra ethylene glycol) ccWater m Starch 'grams-- 3 The amount of coating is 0.8 gram 1 ",x

A design was produced on this'coated copy sheet by typing, using a blackcarbon paper con-V taininga basic nigrosine dye. This sheet containingthe black 'dye design was then applied P to a hectograph blanket oftheordinary im consisting, for example. of glue or gelatin, 30 parts byweight, water, parts and glycerin 300 parts, whereupon the-black dye ofthe'design was largely transferred to the hectograph mass.

Copies were then produced from-the hectogrsphfl mmass inthe'conventional manner without application of any solvent or resort toany special procedure.- It was found that atleast thirtythis manner. as

M Exam A sheet of paperwas coated with the following composition; Butylcarbitol (di-ethylene glycol butyl 30 ether) v ca 10 Wa a 1 Gelatingrams" -3 Kaolin go 10 Adesignwasproducedonthissheetbytyping.

using a carbon paper con ning a mixture of iuchsin and malachite greenin proportions of 1:2. The sheet containing the design was then used toobtain copies by the ordinary hectograph process. Similar results as forExample 1 were While has been shown and described certain, embodimentsof the invention, it-is to be understood that it is capable of manymodifications. Changes-in the proportions, and suhsti'tu-j tion ofequivalent materials may be made without departing from the spirit andscope of the" in view or the prior art.

I claim: r

V 1.Theprocess.of reprod' "comprises applying a design formed of asoluble ng tdesigns which dye'toasheethavinguhiiormlydiltrihutedcn itssurface a glycerin miscible solvent having a greater solvent power thanglycerin for said dye, and contacting the. design on said sheet with ahectograph copy mass to transfer the design to said mass.

2. The process of reproducing designs which comprises applying a designformed of a basic -nigrosine dye to the surface of a sheet containing onits surface a glycerin miscible solvent having a greater solvent powerthan glycerin for said basic nigrosine dye, contacting the design onsaid sheet with a copy pad to transfer the design to said pad, andcontacting a copy sheet with the copy pad to transfer the design to said.copy sheet.

3. A copy sheet having distributed on its's'urface a compositioncomprising a dye solvent and an absorbent substance adapted to retainthe dye solvent at the surface of the sheet, said dye 4 remain in thesheet over a prolonged period of solvent'being of sufliciently lowvolatility as to time under normal conditions, of greater solvent powerthan glycerin, and soluble in glycerin and the surface of'the sheet.

6. A copy sheet having distributed on its surglycol and an absorbentsubstance adapted to reface apcompositioncomprising di-methoxytetra tainthe di-methoxytetra glycol at the surface of the sheet.

7'. A. copy sheet having distributed on its surface a compositionpomprising di-ethylene glycol butyl ether, gelatin, and an absorbentclay.

8. A copy sheet having distributed on its surface a compositioncomprising di-methoxytetra glycol and starch.

9. The process-of reproducing designs which comprises applying a designformed of a water or alcohol soluble dye to a sheet having uniformlydistributed on its surface a composition comprising a solvent from thegroup consisting of ethers of glycols d polyglycols, contacting thedesign on said she t with a copy pad to transfer the design to said pad,and contacting a copy sheet with the copy pad to transfer the design tosaid copy sheet.

10. The process of reproducing designs which comprises applying a designformed of a water or alcohol soluble dye to a sheet having uniformlydistributed on its surface a composition comprising di-ethylene glycolbutyl ether, contacting the design on said sheet with acopy pad totransfer the'design to said pad, and contacting a copy sheet with thecopy pad to transfer the design to said copy sheet.

11. The process of reproducing designs which comprises applying a designformed of a water 'oralcohol soluble dye to a sheet having'uniformlydistributed on its surface a composition comprising di-methoxytetraglycol, contactin .the design on said sheet with a copy pad to transferthe design to said pad, and contacting a copy sheet with the copy pad totransfer the design to said copysheet.

. HOWARD E. COLLINS.

